Flutter SingleChildScrollView颤振中的Streambuilder错误
这是封装在脚手架主体内SingleChildScrollView下的streambuilder。将streambuilder置于SingleChildScrollView下后,滚动视图不工作。StreamBuilder通过云firestore从firebase获取数据Flutter SingleChildScrollView颤振中的Streambuilder错误,flutter,Flutter,这是封装在脚手架主体内SingleChildScrollView下的streambuilder。将streambuilder置于SingleChildScrollView下后,滚动视图不工作。StreamBuilder通过云firestore从firebase获取数据 body: Container( child: SingleChildScrollView( child: Column( mainAxisAli
body: Container(
child: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Expanded(
child: StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection(
'blogsDatabase/${widget.blogUIDInFirebase}/comments')
.snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Center(child: CircularProgressIndicator());
}
final _commentsFetched = snapshot.data.documents;
List<CommentBubble> _commentBubbleWidget = [];
for (var comment in _commentsFetched) {
_commentBubbleWidget.add(
CommentBubble(
name: comment.data['name'],
comment: comment.data['comment'],
),
);
}
return Expanded(
child: ListView(
children: _commentBubbleWidget
),
);
},
),
),
Container(
margin: EdgeInsets.all(10),
child: Material(
shadowColor: Colors.orange,
child: TextField(
onChanged: (value) {
readerAddComment = value;
},
keyboardType: TextInputType.emailAddress,
decoration:
kRegDetailFieldDeco.copyWith(hintText: 'Add comment'),
),
),
),
FlatButton(
onPressed: () {
if (_nameReader != null &&
widget.readerEmail != null &&
readerAddComment != null) {
Firestore.instance
.collection(
'blogsDatabase/${widget.blogUIDInFirebase}/comments')
.document()
.setData(
{
'name': _nameReader,
'email': widget.readerEmail,
'comment': readerAddComment,
},
);
}
},
child: Text('Add comment')),
],
),
),
),
控制台中显示错误
RenderBox was not laid out: RenderRepaintBoundary#dd879 relayoutBoundary=up1 NEEDS-PAINT
'package:flutter/src/rendering/box.dart':
Failed assertion: line 1694 pos 12: 'hasSize'
它之所以发生,是因为你的小部件结构是由哪个错误引起的,就像
-Container
-SingleChildScrollView
-Expanded
-Column
-Expanded
-Expanded
-ListView
现在看到你得到的这个错误,它说这是关于大小的错误,将你的列包装在其他一些小部件中而不是展开似乎你需要空间将ListView放在列()中。 移除扩展的小部件,并将其替换为容器。 例如: 容器( 身高:100, 子:ListView( 儿童:_commentBubbleWidget ),) 但是,我不建议您使用上述解决方案。这对UI来说太糟糕了(只是我的意见)。因为,在列中使用ListView。通过使用这种方法,您必须确定ListView的高度。别忘了,手机的尺寸各不相同 最好将ListView分开,并将文本字段放在BottomNavigationBar中。 这是我的:
Scaffold(
appBar: AppBar(
title: textCustom(
'Review ${widget.destination}', Colors.black87, 20, 'Hind'),
leading: IconButton(
icon: Icon(
Icons.arrow_back_ios,
),
onPressed: () {
Navigator.pop(context);
}),
iconTheme: IconThemeData(color: Colors.black87, size: 10),
backgroundColor: Colors.transparent,
elevation: 0.0,
),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: StreamBuilder<QuerySnapshot>(
stream: kategori
.document(widget.kategori)
.collection(widget.subKategori)
.document(widget.docId)
.collection("review")
.orderBy("timeStamp", descending: true)
.snapshots(),
builder:
(BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (snapshot.hasError) return new Text('${snapshot.error}');
if (snapshot.data == null)
return Center(
child: textCustom(
'Loading...', Colors.black87, 14, 'Montserrat'));
final review= snapshot.data.documents;
return snapshot.data.documents.isNotEmpty
? ListView.builder(
itemCount: review.length,
itemBuilder: (context, index) {
return Comment(
name: review[index]['name'],
profilePhoto: review[index]['foto'],
comments: review[index]['review'],
date: (review[index]['timeStamp'] != null)
? DateFormat.yMMMd().format(DateTime.parse(
review[index]['timeStamp']
.toDate()
.toString(),
))
: '',
);
})
: Center(child: Text('Empty'));
}),
),
bottomNavigationBar: Padding(
padding: MediaQuery.of(context).viewInsets,
child: BottomAppBar(
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 8.0),
child: Row(
children: <Widget>[
Expanded(
child: TextField(
controller: textMessageController,
onChanged: (text) {
input = text;
setState(() {
enableButton = text.isNotEmpty;
});
},
textCapitalization: TextCapitalization.sentences,
maxLines: null,
style: TextStyle(
color: Colors.black87,
fontSize: 16,
fontFamily: 'Montserrat'),
decoration: InputDecoration(
enabledBorder: UnderlineInputBorder(
borderSide: new BorderSide(color: Colors.white),
borderRadius: new BorderRadius.circular(8.0),
),
focusedBorder: OutlineInputBorder(
borderSide: new BorderSide(color: Colors.white),
borderRadius: new BorderRadius.circular(8.0),
),
contentPadding:
EdgeInsets.only(left: 16.0, bottom: 16.0, top: 16.0),
hintText: 'Write some review',
),
)),
SizedBox(
width: 8.0,
),
enableButton
? IconButton(
onPressed: handleSendMessage,
icon: Icon(
Icons.send,
color: Color(0xFFDB5C48),
))
: IconButton(
onPressed: () {},
icon: Icon(
Icons.send,
color: Colors.grey,
))
],
),
),
),
),
);
脚手架(
appBar:appBar(
标题:文本自定义(
'Review${widget.destination}',Colors.black87,20,'Hind'),
领先:IconButton(
图标:图标(
Icons.arrow\u back\u ios,
),
已按下:(){
Navigator.pop(上下文);
}),
iconTheme:IconThemeData(颜色:Colors.black87,大小:10),
背景颜色:颜色。透明,
标高:0.0,
),
主体:填充物(
填充:常数边集全部(8.0),
孩子:StreamBuilder(
溪流:kategori
.document(widget.kategori)
.collection(widget.subKategori)
.document(widget.docId)
.收集(“审查”)
.orderBy(“时间戳”,降序:true)
.snapshots(),
建设者:
(BuildContext上下文,异步快照){
if(snapshot.hasError)返回新文本(“${snapshot.error}”);
如果(snapshot.data==null)
返回中心(
孩子:textCustom(
“装载…”,Colors.black87,14,“蒙特塞拉特”);
最终审查=快照.data.documents;
返回snapshot.data.documents.isNotEmpty
?ListView.builder(
itemCount:review.length,
itemBuilder:(上下文,索引){
回复评论(
名称:审阅[索引]['name'],
简介照片:回顾[索引]['foto'],
评论:评论[索引][“评论”],
日期:(查看[索引]['timeStamp']!=null)
?DateFormat.yMMMd().format(DateTime.parse(
查看[索引][“时间戳”]
.toDate()
.toString(),
))
: '',
);
})
:居中(子项:文本('Empty');
}),
),
底部导航栏:填充(
填充:MediaQuery.of(context).viewInsets,
子项:BottomAppBar(
孩子:填充(
填充:常量边集。对称(水平:8.0),
孩子:排(
儿童:[
扩大(
孩子:TextField(
控制器:textMessageController,
一旦更改:(文本){
输入=文本;
设置状态(){
enableButton=text.isNotEmpty;
});
},
text大写:text大写。句子,
maxLines:null,
样式:TextStyle(
颜色:颜色。黑色87,
尺寸:16,
fontFamily:“蒙特塞拉特”),
装饰:输入装饰(
enabledBorder:UnderlineInputBorder(
borderSide:新的borderSide(颜色:Colors.white),
边界半径:新边界半径。圆形(8.0),
),
聚焦顺序:大纲输入边框(
borderSide:新的borderSide(颜色:Colors.white),
边界半径:新边界半径。圆形(8.0),
),
内容填充:
仅限边集(左:16.0,下:16.0,上:16.0),
hintText:“写一些评论”,
),
)),
大小盒子(
宽度:8.0,
),
启用按钮
?图标按钮(
onPressed:handleSendMessage,
图标:图标(
Icons.send,
颜色:颜色(0xFFDB5C48),
))
:图标按钮(
按下:(){},
图标:图标(
Icons.send,
颜色:颜色。灰色,
))
],
),
),
),
),
);
Scaffold(
appBar: AppBar(
title: textCustom(
'Review ${widget.destination}', Colors.black87, 20, 'Hind'),
leading: IconButton(
icon: Icon(
Icons.arrow_back_ios,
),
onPressed: () {
Navigator.pop(context);
}),
iconTheme: IconThemeData(color: Colors.black87, size: 10),
backgroundColor: Colors.transparent,
elevation: 0.0,
),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: StreamBuilder<QuerySnapshot>(
stream: kategori
.document(widget.kategori)
.collection(widget.subKategori)
.document(widget.docId)
.collection("review")
.orderBy("timeStamp", descending: true)
.snapshots(),
builder:
(BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (snapshot.hasError) return new Text('${snapshot.error}');
if (snapshot.data == null)
return Center(
child: textCustom(
'Loading...', Colors.black87, 14, 'Montserrat'));
final review= snapshot.data.documents;
return snapshot.data.documents.isNotEmpty
? ListView.builder(
itemCount: review.length,
itemBuilder: (context, index) {
return Comment(
name: review[index]['name'],
profilePhoto: review[index]['foto'],
comments: review[index]['review'],
date: (review[index]['timeStamp'] != null)
? DateFormat.yMMMd().format(DateTime.parse(
review[index]['timeStamp']
.toDate()
.toString(),
))
: '',
);
})
: Center(child: Text('Empty'));
}),
),
bottomNavigationBar: Padding(
padding: MediaQuery.of(context).viewInsets,
child: BottomAppBar(
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 8.0),
child: Row(
children: <Widget>[
Expanded(
child: TextField(
controller: textMessageController,
onChanged: (text) {
input = text;
setState(() {
enableButton = text.isNotEmpty;
});
},
textCapitalization: TextCapitalization.sentences,
maxLines: null,
style: TextStyle(
color: Colors.black87,
fontSize: 16,
fontFamily: 'Montserrat'),
decoration: InputDecoration(
enabledBorder: UnderlineInputBorder(
borderSide: new BorderSide(color: Colors.white),
borderRadius: new BorderRadius.circular(8.0),
),
focusedBorder: OutlineInputBorder(
borderSide: new BorderSide(color: Colors.white),
borderRadius: new BorderRadius.circular(8.0),
),
contentPadding:
EdgeInsets.only(left: 16.0, bottom: 16.0, top: 16.0),
hintText: 'Write some review',
),
)),
SizedBox(
width: 8.0,
),
enableButton
? IconButton(
onPressed: handleSendMessage,
icon: Icon(
Icons.send,
color: Color(0xFFDB5C48),
))
: IconButton(
onPressed: () {},
icon: Icon(
Icons.send,
color: Colors.grey,
))
],
),
),
),
),
);